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 *
 *  Copyright Insight Software Consortium
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *         http://www.apache.org/licenses/LICENSE-2.0.txt
 *
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 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
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/** Example illustrating use of ComplexToComplexFFTImageFilter
 *
 * \author Simon K. Warfield simon.warfield\@childrens.harvard.edu
 *
 * \note Attribution Notice. This research work was made possible by Grant
 * Number R01 RR021885 (PI Simon K. Warfield, Ph.D.) from
 * the National Center for Research Resources (NCRR), a component of the
 * National Institutes of Health (NIH).  Its contents are solely the
 * responsibility of the authors and do not necessarily represent the
 * official view of NCRR or NIH.
 *
 * Contributed to the Insight Journal paper:
 * http://insight-journal.org/midas/handle.php?handle=1926/326
 *
 */

#include "itkImageFileReader.h"
#include "itkImageFileWriter.h"
#include "itkComplexToComplexFFTImageFilter.h"
#include "itkForwardFFTImageFilter.h"
#include "itkInverseFFTImageFilter.h"
#include "itkTestingMacros.h"

template< typename TPixel, unsigned int VDimension >
int transformImage( const char * inputImageFileName, const char * outputImageFileName )
{
  using RealPixelType = TPixel;
  using ComplexPixelType = std::complex< RealPixelType >;
  const unsigned int Dimension = VDimension;

  using RealImageType = itk::Image< RealPixelType, Dimension >;
  using ComplexImageType = itk::Image< ComplexPixelType, Dimension >;

  using ReaderType = itk::ImageFileReader< RealImageType >;
  typename ReaderType::Pointer reader = ReaderType::New();
  reader->SetFileName( inputImageFileName );

  using ForwardFilterType = itk::ForwardFFTImageFilter< RealImageType, ComplexImageType >;
  typename ForwardFilterType::Pointer forwardFilter = ForwardFilterType::New();
  forwardFilter->SetInput( reader->GetOutput() );

  using ComplexFilterType = itk::ComplexToComplexFFTImageFilter< ComplexImageType >;
  typename ComplexFilterType::Pointer inverseComplexFilter = ComplexFilterType::New();
  inverseComplexFilter->SetInput( forwardFilter->GetOutput() );
  inverseComplexFilter->SetTransformDirection( ComplexFilterType::INVERSE );

  typename ComplexFilterType::Pointer forwardComplexFilter = ComplexFilterType::New();
  forwardComplexFilter->SetInput( inverseComplexFilter->GetOutput() );
  forwardComplexFilter->SetTransformDirection( ComplexFilterType::FORWARD );
  // This tests the CanUseDestructiveAlgorithm state with the FFTW version.
  forwardComplexFilter->ReleaseDataFlagOn();

  using InverseFilterType = itk::InverseFFTImageFilter< ComplexImageType, RealImageType >;
  typename InverseFilterType::Pointer inverseFilter = InverseFilterType::New();
  inverseFilter->SetInput( forwardComplexFilter->GetOutput() );

  using WriterType = itk::ImageFileWriter< RealImageType >;
  typename WriterType::Pointer writer = WriterType::New();
  writer->SetFileName( outputImageFileName );
  writer->SetInput( inverseFilter->GetOutput() );

  try
    {
    writer->Update();
    }
  catch( itk::ExceptionObject & error )
    {
    std::cerr << error << std::endl;
    return EXIT_FAILURE;
    }

  return EXIT_SUCCESS;
}

int itkComplexToComplexFFTImageFilterTest( int argc, char * argv[] )
{
  if( argc < 4 )
    {
    std::cerr << "Usage: " << itkNameOfTestExecutableMacro(argv) << " <InputImage> <OutputImage> <float|double>" << std::endl;
    return EXIT_FAILURE;
    }
  const char * inputImageFileName = argv[1];
  const char * outputImageFileName = argv[2];
  const std::string pixelTypeString( argv[3] );

  itk::ImageIOBase::Pointer imageIO = itk::ImageIOFactory::CreateImageIO( inputImageFileName, itk::ImageIOFactory::ReadMode );
  imageIO->SetFileName( inputImageFileName );
  imageIO->ReadImageInformation();
  const unsigned int dimension = imageIO->GetNumberOfDimensions();

  if( pixelTypeString.compare( "float" ) == 0 )
    {
    switch( dimension )
      {
    case 2:
      return transformImage< float, 2 >( inputImageFileName, outputImageFileName );
    case 3:
      return transformImage< float, 3 >( inputImageFileName, outputImageFileName );
    default:
      std::cerr << "Unknown image dimension." << std::endl;
      return EXIT_FAILURE;
      }
    return EXIT_SUCCESS;
    }
  else if( pixelTypeString.compare( "double" ) == 0 )
    {
    switch( dimension )
      {
    case 2:
      return transformImage< double, 2 >( inputImageFileName, outputImageFileName );
    case 3:
      return transformImage< double, 3 >( inputImageFileName, outputImageFileName );
    default:
      std::cerr << "Unknown image dimension." << std::endl;
      return EXIT_FAILURE;
      }
    return EXIT_SUCCESS;
    }
  else
    {
    std::cerr << "Unknown pixel type string." << std::endl;
    return EXIT_FAILURE;
    }


  return EXIT_FAILURE;
}
